mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 08:26:39 +07:00
d0316554d3
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (34 commits) m68k: rename global variable vmalloc_end to m68k_vmalloc_end percpu: add missing per_cpu_ptr_to_phys() definition for UP percpu: Fix kdump failure if booted with percpu_alloc=page percpu: make misc percpu symbols unique percpu: make percpu symbols in ia64 unique percpu: make percpu symbols in powerpc unique percpu: make percpu symbols in x86 unique percpu: make percpu symbols in xen unique percpu: make percpu symbols in cpufreq unique percpu: make percpu symbols in oprofile unique percpu: make percpu symbols in tracer unique percpu: make percpu symbols under kernel/ and mm/ unique percpu: remove some sparse warnings percpu: make alloc_percpu() handle array types vmalloc: fix use of non-existent percpu variable in put_cpu_var() this_cpu: Use this_cpu_xx in trace_functions_graph.c this_cpu: Use this_cpu_xx for ftrace this_cpu: Use this_cpu_xx in nmi handling this_cpu: Use this_cpu operations in RCU this_cpu: Use this_cpu ops for VM statistics ... Fix up trivial (famous last words) global per-cpu naming conflicts in arch/x86/kvm/svm.c mm/slab.c
285 lines
6.6 KiB
C
285 lines
6.6 KiB
C
/*
|
|
* drivers/base/cpu.c - basic CPU class support
|
|
*/
|
|
|
|
#include <linux/sysdev.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/device.h>
|
|
#include <linux/node.h>
|
|
|
|
#include "base.h"
|
|
|
|
struct sysdev_class cpu_sysdev_class = {
|
|
.name = "cpu",
|
|
};
|
|
EXPORT_SYMBOL(cpu_sysdev_class);
|
|
|
|
static DEFINE_PER_CPU(struct sys_device *, cpu_sys_devices);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static ssize_t show_online(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
|
|
return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id));
|
|
}
|
|
|
|
static ssize_t __ref store_online(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t ret;
|
|
|
|
cpu_hotplug_driver_lock();
|
|
switch (buf[0]) {
|
|
case '0':
|
|
ret = cpu_down(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
|
|
break;
|
|
case '1':
|
|
ret = cpu_up(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_ONLINE);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
cpu_hotplug_driver_unlock();
|
|
|
|
if (ret >= 0)
|
|
ret = count;
|
|
return ret;
|
|
}
|
|
static SYSDEV_ATTR(online, 0644, show_online, store_online);
|
|
|
|
static void __cpuinit register_cpu_control(struct cpu *cpu)
|
|
{
|
|
sysdev_create_file(&cpu->sysdev, &attr_online);
|
|
}
|
|
void unregister_cpu(struct cpu *cpu)
|
|
{
|
|
int logical_cpu = cpu->sysdev.id;
|
|
|
|
unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
|
|
|
|
sysdev_remove_file(&cpu->sysdev, &attr_online);
|
|
|
|
sysdev_unregister(&cpu->sysdev);
|
|
per_cpu(cpu_sys_devices, logical_cpu) = NULL;
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
|
|
static ssize_t cpu_probe_store(struct class *class, const char *buf,
|
|
size_t count)
|
|
{
|
|
return arch_cpu_probe(buf, count);
|
|
}
|
|
|
|
static ssize_t cpu_release_store(struct class *class, const char *buf,
|
|
size_t count)
|
|
{
|
|
return arch_cpu_release(buf, count);
|
|
}
|
|
|
|
static CLASS_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
|
|
static CLASS_ATTR(release, S_IWUSR, NULL, cpu_release_store);
|
|
|
|
int __init cpu_probe_release_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
|
|
&class_attr_probe.attr);
|
|
if (!rc)
|
|
rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
|
|
&class_attr_release.attr);
|
|
|
|
return rc;
|
|
}
|
|
device_initcall(cpu_probe_release_init);
|
|
#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
|
|
|
|
#else /* ... !CONFIG_HOTPLUG_CPU */
|
|
static inline void register_cpu_control(struct cpu *cpu)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
#include <linux/kexec.h>
|
|
|
|
static ssize_t show_crash_notes(struct sys_device *dev, struct sysdev_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t rc;
|
|
unsigned long long addr;
|
|
int cpunum;
|
|
|
|
cpunum = cpu->sysdev.id;
|
|
|
|
/*
|
|
* Might be reading other cpu's data based on which cpu read thread
|
|
* has been scheduled. But cpu data (memory) is allocated once during
|
|
* boot up and this data does not change there after. Hence this
|
|
* operation should be safe. No locking required.
|
|
*/
|
|
addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
|
|
rc = sprintf(buf, "%Lx\n", addr);
|
|
return rc;
|
|
}
|
|
static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
|
|
#endif
|
|
|
|
/*
|
|
* Print cpu online, possible, present, and system maps
|
|
*/
|
|
static ssize_t print_cpus_map(char *buf, const struct cpumask *map)
|
|
{
|
|
int n = cpulist_scnprintf(buf, PAGE_SIZE-2, map);
|
|
|
|
buf[n++] = '\n';
|
|
buf[n] = '\0';
|
|
return n;
|
|
}
|
|
|
|
#define print_cpus_func(type) \
|
|
static ssize_t print_cpus_##type(struct sysdev_class *class, char *buf) \
|
|
{ \
|
|
return print_cpus_map(buf, cpu_##type##_mask); \
|
|
} \
|
|
static struct sysdev_class_attribute attr_##type##_map = \
|
|
_SYSDEV_CLASS_ATTR(type, 0444, print_cpus_##type, NULL)
|
|
|
|
print_cpus_func(online);
|
|
print_cpus_func(possible);
|
|
print_cpus_func(present);
|
|
|
|
/*
|
|
* Print values for NR_CPUS and offlined cpus
|
|
*/
|
|
static ssize_t print_cpus_kernel_max(struct sysdev_class *class, char *buf)
|
|
{
|
|
int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
|
|
return n;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
|
|
|
|
/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
|
|
unsigned int total_cpus;
|
|
|
|
static ssize_t print_cpus_offline(struct sysdev_class *class, char *buf)
|
|
{
|
|
int n = 0, len = PAGE_SIZE-2;
|
|
cpumask_var_t offline;
|
|
|
|
/* display offline cpus < nr_cpu_ids */
|
|
if (!alloc_cpumask_var(&offline, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
cpumask_complement(offline, cpu_online_mask);
|
|
n = cpulist_scnprintf(buf, len, offline);
|
|
free_cpumask_var(offline);
|
|
|
|
/* display offline cpus >= nr_cpu_ids */
|
|
if (total_cpus && nr_cpu_ids < total_cpus) {
|
|
if (n && n < len)
|
|
buf[n++] = ',';
|
|
|
|
if (nr_cpu_ids == total_cpus-1)
|
|
n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids);
|
|
else
|
|
n += snprintf(&buf[n], len - n, "%d-%d",
|
|
nr_cpu_ids, total_cpus-1);
|
|
}
|
|
|
|
n += snprintf(&buf[n], len - n, "\n");
|
|
return n;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(offline, 0444, print_cpus_offline, NULL);
|
|
|
|
static struct sysdev_class_attribute *cpu_state_attr[] = {
|
|
&attr_online_map,
|
|
&attr_possible_map,
|
|
&attr_present_map,
|
|
&attr_kernel_max,
|
|
&attr_offline,
|
|
};
|
|
|
|
static int cpu_states_init(void)
|
|
{
|
|
int i;
|
|
int err = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cpu_state_attr); i++) {
|
|
int ret;
|
|
ret = sysdev_class_create_file(&cpu_sysdev_class,
|
|
cpu_state_attr[i]);
|
|
if (!err)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* register_cpu - Setup a sysfs device for a CPU.
|
|
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
|
|
* sysfs for this CPU.
|
|
* @num - CPU number to use when creating the device.
|
|
*
|
|
* Initialize and register the CPU device.
|
|
*/
|
|
int __cpuinit register_cpu(struct cpu *cpu, int num)
|
|
{
|
|
int error;
|
|
cpu->node_id = cpu_to_node(num);
|
|
cpu->sysdev.id = num;
|
|
cpu->sysdev.cls = &cpu_sysdev_class;
|
|
|
|
error = sysdev_register(&cpu->sysdev);
|
|
|
|
if (!error && cpu->hotpluggable)
|
|
register_cpu_control(cpu);
|
|
if (!error)
|
|
per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
|
|
if (!error)
|
|
register_cpu_under_node(num, cpu_to_node(num));
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
if (!error)
|
|
error = sysdev_create_file(&cpu->sysdev, &attr_crash_notes);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
struct sys_device *get_cpu_sysdev(unsigned cpu)
|
|
{
|
|
if (cpu < nr_cpu_ids && cpu_possible(cpu))
|
|
return per_cpu(cpu_sys_devices, cpu);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_cpu_sysdev);
|
|
|
|
int __init cpu_dev_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = sysdev_class_register(&cpu_sysdev_class);
|
|
if (!err)
|
|
err = cpu_states_init();
|
|
|
|
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
|
|
if (!err)
|
|
err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
|
|
#endif
|
|
|
|
return err;
|
|
}
|